/*哔哩哔哩视频适配*/
.aspect-ratio {
    position: relative;
    width: 90%;
    height: auto;
    padding-bottom: 75%;
    margin: 3% auto;
    text-align: center;
  }
  .aspect-ratio iframe {
    position: absolute;
    width: 100%;
    height: 86%;
    left: 0;
    top: 0;
  }